Simple calculator code problem

I need help with my code. this is a simple calculator. My addition seems to work fine. but in subtraction, when the answer is only one digit.. the first digit seems messed up. Special character shows up. This program is supposed to be accepting 2 digit number, example 02 + 04 = 06.. My addition works fine but im having problems with subtraction. anybody here who could assist me with this? is anything wrong with my code? thanks in advance

I need help with my code. this is a simple calculator. My addition seems to work fine. but in subtraction, when the answer is only one digit.. the first digit seems messed up. Special character shows up. This program is supposed to be accepting 2 digit number, example 02 + 04 = 06.. My addition works fine but im having problems with subtraction. anybody here who could assist me with this? is anything wrong with my code? thanks in advance